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비정질 수산화제이철로 부터 자기 기록 매체용 전구체인 헤마타이트 입자의 제조
변태봉(Tae-Bong Byeon),손진군(Jin-Gun Sohn),김태옥(Tae-Ok Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
Needle-like α-Fe₂O₃ particles as precursor for magnetic recording media were prepared directly from amorphous ferric hydroxide in the aqueous solution by hydrothermal reaction.<br/> Ellipsoidal or rectangular α-Fe₂O₃ particles were formed in the range of pH 10.75~11.75. The length and acicularity of α-Fe₂O₃ particles were decreased gradually with increasing of citric acid concentration. The formation of needle-like α-Fe₂O₃ particles was inhibited above citric acid concentration of 1.5×10-⁴㏖. We can synthesize α-Fe₂O₃ particles with the most superior acicularity at 140 ℃ and can not expect a good needle-like particles above 220 ℃.